Fig. 1From: SARS-CoV-2 viral load in sputum correlates with risk of COVID-19 progressiona Comparison of baseline sputum viral load between severe and mild-to-moderate patients at admission or between those becoming severe and those did not during the hospitalization. b Relationship between the estimated probability of disease progression during the hospitalization and baseline sputum viral load. Viral load is indicated by the Ct value of RT-PCR assay. The asterisk indicates a P value < 0.05Back to article page